Amp identification

[P4tches]

I have an old magnavox phono amp with 1 12ax7, two 6bq5s and a 5y4 rectifier,two opts with three wire, one goes to 6bq5 plate one to 30 mfd cap and the other to the rec or the power trans. is this single ended or????? Also sorry I'm new feel free to correct me on whatever thanks.

 

[Richidoo]

Welcome to diyaudio.

If it's stereo, then yes, SE. Only one triode/ch on the input tube 12ax7, and one triode in each of the output current buffer tubes.

If it's mono signal output, then it could be push pull, but I think that would require the EL84s to share one OPT.

 

[madisonjam85]

Sounds very similar to a Zenith console amp I have. I was confused at first as well. My understanding is there is a hum-bucking winding within the OPT for the power supply. Pretty sure it goes between the first and second capacitor stages.

 

[P4tches]

Yes it's stereo, and hum bucking?

 

[DF96]

Ripple cancellation via an OPT tap was a common trick on cheaper/older amps and radios.

It might be sensible to ask the Mods to merge this with your other thread. You can self-report by clicking on the red triangle at the bottom left.

 

[jazbo8]

Is it this one? If so, it is a 6BQ5/EL84 SE amp.